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Table of Contents CO2 Heat Pump Water Heater Multifamily Retrofit: Seattle WA ..........................................................ii A Report for the BPA Emerging Technologies Initiative............................................................................ii Table of Contents .................................................................................................................................................. iii Table of Figures ...................................................................................................................................................... iv Table of Tables........................................................................................................................................................ iv Acronyms .................................................................................................................................................................. iv Acknowledgements.................................................................................................................................................v Abstract .......................................................................................................................................................................v Executive Summary ................................................................................................................................................ 1 Background............................................................................................................................................................... 2 System Design ................................................................................................................................................... 4 Photographs ....................................................................................................................................................... 7 Methods ..................................................................................................................................................................... 9 Findings .................................................................................................................................................................... 10 Summary Findings..........................................................................................................................................10 Maintenance Timeline...................................................................................................................................10 Water Temperatures......................................................................................................................................12 Water Use..........................................................................................................................................................13 DHW System Performance..........................................................................................................................15 HPWH Duty Cycle...........................................................................................................................................16 Temperature Maintenance and Swing Tank Operation....................................................................17 Backup System.................................................................................................................................................18 Financial Analysis............................................................................................................................................19 Additional insights from local HPWH installations.............................................................................19 Key Design Principles ....................................................................................................................................21 Conclusion and Recommendations ...............................................................................................................21 References ............................................................................................................................................................... 24 Appendix A – Major Monitoring and Maintenance Events...................................................................25 Assumptions ........................................................................................................................................................... 28 BONNEVILLE POWER ADMINISTRATION iiiPDF Image | CO2 Heat Pump Water Heater Multifamily Retrofit
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